It used to be I could always tell who had gotten a degree as an engineer of some kind (usually electrical but sometimes mechanical).

If their engineering had any connection to computers, they learned FORTRAN. After that, the only data structure they used in any code they ever wrote -- which computer science geeks like me had to figure out and maintain -- was the array.

Sometimes they would invent a complicated version of linked lists on their own that directly used arrays. Lots of arrays. Pointing to other arrays. Which weren't commented, because the code was obvious.

I have no idea what programming language engineers are taught these days. Whatever it is, I'll bet they still aren't required to take a Data Structures class.